/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineSessionInterface.h
Creates an online session based upon the settings object specified. NOTE: online session registration is an async process and does not complete until the OnCreateSessionComplete delegate is called.
true if successful creating the session, false otherwise
bool CreateSession ( int32 HostingPlayerNum, [FName](API\Runtime\Core\UObject\FName) SessionName, const [FOnlineSessionSettings](API\Plugins\OnlineSubsystem\FOnlineSessionSettings) & NewSessionSettings )